Milk Opal (Porcelain Opal)
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Physical & Optical Properties
Category
Semi-Precious Gems
Mohs Hardness
5.5 – 6.5
Specific Gravity
1.98 – 2.5
Refractive Index
1.37 – 1.52
Crystal System
Amorphous
Cleavage
None
Fracture
Conchoidal,Splintery
Color
white
Pleochroism
Absent
Mohs Hardness
| Mohs | Reference mineral | Milk Opal (Porcelain Opal) |
|---|---|---|
| 1 | Talc | |
| 2 | Gypsum | |
| 3 | Calcite | |
| 4 | Fluorite | |
| 5 | Apatite | |
| 6 | Orthoclase | ● |
| 7 | Quartz | |
| 8 | Topaz | |
| 9 | Corundum | |
| 10 | Diamond |
Crystal System
Value & Market
Price Tier
Budget (< $50/ct)
Where to Buy Milk Opal (Porcelain Opal)
Blue Nile
Fine jewelry retailer
James Allen
Gemstone jewelry
Brilliant Earth
Ethically sourced gems
Amazon
Wide selection
Links may earn a commission at no extra cost to you.
About Milk Opal (Porcelain Opal)
ミルクオパール（磁器オパールとも呼ばれる）は、遊色がほとんどあるいは全くない半透明〜不透明の乳白色を呈するコモンオパールの変種で、蝋状〜硝子光沢を持ち、上質の白い磁器または霜ガラスに似た外観です。火山性・堆積性環境で形成され、メキシコ、ペルー、アメリカ、オーストラリアに広く産出します。カボション・ビーズ・装飾彫刻品として使われ、清潔感ある発光する白色の外観と比較的手頃な価格が特長です。
On this page
Jewelry Use
Durability
4/10
Science FYI Family
Frequently Asked Questions
What is Milk Opal (Porcelain Opal)?
ミルクオパール（磁器オパールとも呼ばれる）は、遊色がほとんどあるいは全くない半透明〜不透明の乳白色を呈するコモンオパールの変種で、蝋状〜硝子光沢を持ち、上質の白い磁器または霜ガラスに似た外観です。火山性・堆積性環境で形成され、メキシコ、ペルー、アメリカ、オーストラリアに広く産出します。カボション・ビーズ・装飾彫刻品として使われ、清潔感ある発光する白色の外観と比較的手頃な価格が特長です。
What is the hardness of Milk Opal (Porcelain Opal)?
Milk Opal (Porcelain Opal) has a Mohs hardness of 5.5 to 6.5, making it moderate for use in jewelry.
What color is Milk Opal (Porcelain Opal)?
Milk Opal (Porcelain Opal) is primarily White.
How much does Milk Opal (Porcelain Opal) cost?
Milk Opal (Porcelain Opal) falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Milk Opal (Porcelain Opal)?
Milk Opal (Porcelain Opal) belongs to the Amorphous crystal system.